Numerical investigation on vibration and noise induced by unsteady flow in an axial-flow pump

Chen, Eryun; Ma, Zuiling; Zhao, Gaiping; Li, Guoping; Yang, Ailing; Nan, Guofang

doi:10.1007/s12206-016-1107-4

Cited by 27 publications

(17 citation statements)

References 7 publications

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“…Figure 3 describes the monitoring points in the axial-flow pump, which is located on different sections along the axial direction, namely, the impeller inlet, tip clearance, the interface between the impeller and guide-vane, and guide-vane outlet (respectively, located on z=0.033m, z=0.0m, z=-0.075m, and z=-0.21m), where the points marked P5, P6, P11, and P16 are located at the inner surface of the casing, others at the inside of axial pump. In our previous studied work [13], the frequency spectrum of pressure fluctuations of monitoring points located at the inner surface of the casing was investigated. In this paper, we further evaluated the variation of pressure coefficient fluctuations along the radial direction.…”

Section: Computational Domain and Boundary Conditionsmentioning

confidence: 99%

“…The coefficients used are Elasticity modulus E=210GPa, density = 7850Kg/m 3 , and Poisson ratio = 0.3. Moreover, for validating computed modal, the comparisons between the computed results and experimental results are performed, a detailed description of which can be seen in [13]. Figure 11 shows the vibration acceleration frequency spectrum characteristics for sampled points M1, M2, and M3, shown in Figure 10, when the axial-flow pump works at nominal flow rate.…”

Section: Vibration Modelmentioning

confidence: 99%

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Effect of Guide Vanes on Flow and Vibroacoustic in an Axial-Flow Pump

Chen

Yang

et al. 2018

Mathematical Problems in Engineering

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An effect of guide-vane numbers on pressure fluctuations and structural vibroacoustics induced by unsteady flow is performed by a hybrid numerical method. A 3D flow field is simulated in axial-flow pump with four impeller blades, in which three diffuser models with 5, 7, and 9 vanes are devised to match, respectively. A full scale structural vibroacoustics coupled model is solved using LMS acoustics software. The results show that the blade-passing frequency (BPF) is dominated frequency of the vibration acceleration of pump, which is consistent with frequency spectral characteristics of pressure pulsation. The unsteady pressure fluctuating becomes strong as the flow discharge decreases from 1.0Qv to 0.6Qv, the circumferential unsteady behavior of which is more severe due to flow nonuniformity induced by the suction elbow at partial operation. Generally, the pressure fluctuating increases slightly when the flow discharge increases from 1.0Qv to 1.3Qv. Moreover, pressure fluctuations amplitude on the pump with 9-vane diffuser is small relative to other two models and the vibrating accelerating and radiation sound field at BPF are also slight relatively, which indicates that appropriate guide-vane numbers contribute to suppress pressure fluctuations and vibroacoustics in axial-flow pump. The conclusions in the present paper can provide theoretical guidance for low vibration pump design.

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Section: Computational Domain and Boundary Conditionsmentioning

confidence: 99%

Section: Vibration Modelmentioning

confidence: 99%

Effect of Guide Vanes on Flow and Vibroacoustic in an Axial-Flow Pump

Chen

Yang

et al. 2018

Mathematical Problems in Engineering

Self Cite

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“…Xie et al [7] compared the pressure pulsation in an axial-flow prototype pump and its scaled model. Chen et al [8] studied the pressure pulsation, vibration acceleration, and noise of an axial-flow pump. Further research on the unsteady flow of axial-flow pump is still required, especially for the axial-flow RCP.…”

Section: Introductionmentioning

confidence: 99%

Effect of Suction and Discharge Conditions on the Unsteady Flow Phenomena of Axial-Flow Reactor Coolant Pump

Chen

et al. 2020

Energies

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In order to study the effects of the suction and discharge conditions on the hydraulic performance and unsteady flow phenomena of an axial-flow reactor coolant pump (RCP), three RCP models with different suction and discharge configurations are analyzed by computational fluid dynamics (CFD) method. The CFD results are validated by experimental data. The hydraulic performance of the three RCP models shows little difference. However, the unsteady flow phenomena of RCP are significantly affected by the variation of suction and discharge conditions. Compared with that of Model E-S (baseline, elbow-single nozzle), the pressure pulsation in rotating frame of Model S-S (straight pipe-single nozzle) and Model E-D (elbow-double nozzles) is weakened in different degrees and forms, due to the more uniform flow fields upstream and downstream of the impeller, respectively. It indicates that the generalized rotor-stator interaction (RSI) actually exists between the rotating impeller and all stationary components causing the circumferentially non-uniform flow. Furthermore, improving the circumferential uniformity of the flow upstream and downstream of impeller (suction and discharge flow) also contributes to reducing the radial dynamic fluid force acting on the impeller. Compared with those of Model E-S, the dynamic FX and FY of Model S-S are severely weakened, and those of Model E-D also gain a minor amplitude decrease at fBPF. In contrast, the general pressure pulsation in fixed frame is mainly related to the rotating impeller and barely affected by the suction and discharge conditions.

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“…1 The vortex, rotor-stator interaction, rotating stall, and cavitation are the main hydraulic causes for pump vibration. [2][3][4][5][6] Basically, the forced vibration is one of the typical vibration modes that was distinguished in a pump. It is generated if a system consisting of mass, spring, and damping is excited by a periodic force.…”

Section: Introductionmentioning

confidence: 99%

Integrated topology optimization for vibration suppression in a vertical pump

Zhang

Ren

et al. 2019

Advances in Mechanical Engineering

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This article presents a new approach aiming to reducing pump vibration by modifying its baseplate structure. The finite element models of the vertical pump were established and validated by the experimental impact test. The natural frequencies of pump were mapped in both experimental and numerical methods. The weak stiffness of the baseplate was identified as the root cause for the pump vibration. A topology optimization was used for enhancing the stiffness of baseplate and controlling its weight. The new baseplate was designed according to the inputs from optimization results and manufactured by the casting method. Both the vibration tests and the numerical simulations were carried out to investigate the vibration behaviors of the optimized pump model. The differences of vibration characteristics between original and optimized pumps were evaluated using 1/3 octave-band filter technique. Results show that the vibration was suppressed, and the resonance at 31.5 Hz was eliminated using the optimized baseplate. In particular, the maximum vibration amplitude of the vertical pump was reduced from 4.05 to 1.75 mm/s at the low flow rate condition. It was experimentally confirmed that the vibration amplitude of the optimized model complies with the requirements of the International Organization for Standardization standard and ensures the pump can operate stable for a long time.

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Numerical investigation on vibration and noise induced by unsteady flow in an axial-flow pump

Cited by 27 publications

References 7 publications

Effect of Guide Vanes on Flow and Vibroacoustic in an Axial-Flow Pump

Effect of Guide Vanes on Flow and Vibroacoustic in an Axial-Flow Pump

Effect of Suction and Discharge Conditions on the Unsteady Flow Phenomena of Axial-Flow Reactor Coolant Pump

Integrated topology optimization for vibration suppression in a vertical pump

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